Improved machine for threading bolts



r dem sind Leners Parmi 1v'. 96,493, daad Novanta 2, 1869.

IMPovED MACHINE PoR T HnnADING Bours.

The scbndulerefen'ed to in these Letters Patent and, making part of the same.

Tc all lwhom it Imay concern Be it known that l, CHARLES E. Dn VALIN, of Baltimore, Vin the county of Baltimore, and in the State of li'laryland, have invented -certain new and useful Im,- provements in Automatic Bolt and Scre\\'-Outters; ant` do hereby declare that .the following isl a full, clear, and exactdescription thereof, reference being had to the accompanying,r drawings` and to the letters ot'rci'- erence marked thereon, making a part of this specification.

The nature of' my invention consists in the construction andgeneral arrangement of an automatic bolt and screw cutter.

In order to enable others skilled inthe alt to which my invention.appertains, to make and use the same, I-wil1 now proceed to describe its construction and operation, referringto the annexed drawings, in which-'4 Figure ,l is a plan view of the entire machine;

Figure 2 is an end view of the rear side ot' themachino, showing a portion of lthe feeding-mechanism;

Figure 3 is a side view of a. portion of the main shaft, showing` the mechanism formoving the same longitudinally forward and backward;

Figure 4 is an inside .view ot' one ot the side plates .of the machine, showing the guides;

Figure 5 is a side view ot' the feeding-bar and the mechanism connected with the same;

Figure (ifis a frontl view ot' the die-box;

Figure 7 is an inside view ot' the die-box, the front plate being removed, showing the manner ot' operating the Acutting-dies; 4

Figure 8 is also au inside view of the die-box, the

I front plate and circumferential ring being removed;

Figure 9 isa side view of a tumbler-stop, used to close the dies in the die-box;

Figure l() is a vertical section .of the die-box, att'ached to the front end-of the main shaft; A

Figure 11 is an enlarged perspective view of one of the cutting-dies;

Figure 12 is a side vi'ew of a portion of the feeding.- mechansm,the balance ot'said mechanism being shown in tig. 2;

Figure 13 is a vertical section of a portion of. the face-plate, showing the manner ot' holding the bolts that are to be cut; and

Figure 14 is a horizontal section of a portion ofthe face-plate, showing the dovetailed recess and opening in the saine.

A rein'esenis the main shaft, 'revolving in three bear; ings, B, B', 'and 1&2. These three bearingsare sustained by one bed-plate, the whole constituting one piece, and supported by a suitable trame-work.

D represents the dic-lnix, for holding three cuttingdies or cutters, a u, in this case, but, it' desirable, the

die-box may be constructed to hold a. greater or less numberot' 'cutting-dies. v- The die-box D is cylindrical for a distance,- froni the Qing-dies a a, and thickness ot' the sliding can-ier-har b. In this cylindrical portion ofthe die-box th'ere arev three rectangular slots or recesses, open at the tiont outer circumference of the cylindrical part to a hole which is bored at the centre, in the direction ofthe axis of the die-box, large enough in diameter to pass freely over the largest bolt theinachine' is int-ended to apart, and have a radial direction.

lhe cutting-dies a a are vectangular in their crosssection, and ot' such length, that when closed, the outer ends come even, withthe outside 'circumference ends, forming the die proper, are in the cutting the desired thread. y

yThere areopen spaces between the inner ends of the'cutting-diesas 'seen iu tige-7 and 8, for the escape of chips. l

At the front ot the dies'the thread is not full, that is, the ends of the teeth are cut away, so that la full thread is not made'nnt-il they bolt has passed several threads in the cutting-dies.

The cutting-faces of theteeth, at thefront, are also chamfered ofi, as seen in tie. 11, so as 'to vmakeacute angles for the cutting-edges. Y

,Un the front end of the die-box there is a' circular spond with the hole inthe die-box, secured'to the dievbox by'screws with countersunk heads, as seen in iig.v 6. This plate contines the dies to their slots or recesses in the d-iebox.

At the rear end ot' the cylindrical part of the diebox, there is a circular flange or collar, d, continuedentirely around the die-box, with its front l'ace at right angles with the axis of the cylindrical part of the'. die`- box, andvparallel with the circular disk c on the front of thedie-lox.

Between this angeand the front plate or disk there is contained a ring,- e, of the saine outside vdiameteras the collar or flange d, and vof the same inside diameter cutting-dies. i

lAt equal distances apart, on the inside surface of the ring c', there are recesses, as seen in tinj?, one for each 'cutting-die, s that when the dies are brought far enough to allow the bolt, which has been .cut,`to be withdrawn The sides of these recesses in the ring, for the' cut front end,'a little greater than the depth of the cut# end of the die-box, and extending through from the' cut. These slots or recesses are at equal distances of the'cylindricat partof the die-box, and ltheir inner.

position ffor I disk, c', or plate, with a hole at the centre toy corre- 4 respective ,as' the cylindrical part 'of the die-box containing the y opposite the recesses, they have room to move outward n .B and that lit fits between.

'ting-dies, form inclined planes, aud-the outer ends of the cutting-dies are rounded, so that when the die-box is revolved, and the ring held stationary, the outer ends of the dies coming in contact with the inclined planes, the dies are gradually closed until the circular part ofthe inside surface of the ring is in contact with the outer ends of the dies..

In the rear face of the ring ethere is a slot or recess for the reception of the sliding carrier-bar b. This sliding carrierdiar is confined to its recess or slot by coming in contact with the front face of the flange or collar d before mentioned.'

In the front face of this collar or flange there is a cam-groovej; continued all the4 way Pollini, and following such directions, that when the ring chas closed the cutting-dies, one portion of the groove, farthest from he axis of -the die-box, is opposite the sliding carrierar bf This bar passes freely in a radial direction in ,thev slot in the ring c,vand has a pin on its rear. side, which' tits in'the camgroove f of the flange or collar r1, as

seen 4in fig. 8.

When this pin occupies a position in the cam-groove.

vfarthest-fiom the` axis of the die-box, the outer end of the sliding carrier-bar b extends' beyond the outer surface or circumference of the ring e its gleatestdistance, and when the pln is `in, that part of t-he groove nearest the axis 'of the die-box, `the carrier-har' is `drawn to its position nearest the axis of the die-box.

The-outer end of the sliding carrier-bar b hasA an elbow, turned at right angles to the part occupying thc slot,'and parallel with the axis of the die-box, as shown in tlgs..1 and 10.

To therear of the"llange or collar z of the 'die-box there is a boss, lby which the die-box is secured to the front end ot' the main shaft A.

In suitable openings at the bottoms of the recesses or slots for the cutting-dies a a, are inserted springs 'i t', the ends of which enter notchesjin the rear sides of the dies, and have a tendency to force the dies apartn radial directions. 4 y

l Themaiu shaft A has a hole bored inthe frontend, corresponding with .the hole at the centre of the diehox, deep enough to clear the bolts to becut.

Ou the main shaft A, and between the rst and.

.intended tovhe cut.A

`The geared drivingwheel ll is prevented from moving longitudinally with the Ishaft by the two bearings By means of the feather in the wheel E, the shaft l is revolved with the wheel. Between the 'second and third bearings, Bl and B, there is situated a yoke, F, on the mailt shatt.A, which yoke is confined between twocollars, g g, on the shaft, but the shaft'is free to revolve in-fthe yoke. I

Throngln the other end of the. yoke F, under the main shaft,.and parallel with it, there is ascrew, G, for advancing the main shaft, revolving in bearings in the frame of the machine.

In the yoke F, over the'screw G, there is a half or other portion ot'a nut, h, which moves up and ,down in a slot cut through the yoke, ansverse t`o the SUI'PW.

This nut has two pins or arms, o o, one on either side, which, when the nut is in gear with the screw, pass under adjustable guides k, parallel withthe screw. j

There is a horizontal shaft passed through the yoke F, above and transverse to the screw G, on each end of which, and close up against the sides of the yoke,

there is a heut lever, l, secured at its angle to the end of the shaft.

The upper ends of these levers l l havelugs on the l seen in fig. .5.

Parallel with the vscrew G,and on both sides of the yoke, there are two side-plates secured to the flame of the machine, and through these side-plates are cut two slots. parallel with the scnew G and main shaft A, for the reception ofthe shanks of the guides lc k. These guides are t-wo in number, secured, one to each sideplate, on the inside, next the yoke. Each guide is formed of two pieces.- The rear piece of each guide, as seen in figs. l and 4, is a har placed parallel with the screw and the main shaft, and connected at its rear end'to a flange, and having a space between it and said flange for the passage ot' the parallel bar of `the forward piece of the guide.

The flange bears against the side-plate, and has a rectangular shank, which is of the same `width as the slot in the side-plate. On this shank are a screw-unt and washer, which projection the outside of the sideplate, and arefor the purpose ot' securing the guide in its proper position.

One or both of these rear pieces is allowed to move freely along thc-slot inthe side-plate, and is provided with a very flexible spring, m, shown in lig. 1, for fore# ing its shank againstthe rear end of thc slot in the sidepla-te. When only one of these` rearl pieces is provided with a spring, the rear piece of the other guide is secured lirmly in its proper. position on the sideplate.

The rear end ofthe parallel bar of this rear piece of 'the guide k is `not square, but inclined'downward and backward.' l A The forward piece of each guide is composed of a parallel' bar of th'ejsanle width as the har of, the rear piece described,'a|ul` of such'thickuess that it maypass between the rear bar and vits flange. The bar of the forward piece. is evenandpz'uallel with the bar ofthe rear piece, and is provided with a flange, shank, screws,

nuts, and washers for seeming it to the-guideplate, the one slot in each side-plate answering for the shauks Iof the twofpieccs of the guide.

ing an inclined plane, which inclines forward and up,

ward, as seen in lig..4v,andvso far from the forward end of thc parallel bar. that the pin, or arm o of the half l n'ut h., before mentioned, may pass between them.`

.This saine projection or extra. thickness of flange rcontinues in front and above the 4forward end of the parallel bal-with room for the before-mentioned pin of the' halt' nut vto pass over the end of the parallel bar, and projects sofar in toward the volte F, that the lug on the bent lever l, on the yoke, may strike it as the yoke moves forward.

On the top, and passing down to the rear of this harige,- there is a spring, p', for the lugv of the heilt lever before mentioned to press upon as 'it advances for-` ward.

On the rear end of the screw G, to the rear of its hearing, is secured a gear-wheel, H, and suspended between said wheel and bearing, ou the screw, is an arbor, I, forming a. sector, and revolving about said screw as a centre. j j

The arbor I has ahole at each end of its are, as seen in tig. 2, for a screw-stud, lr, which has a nut at each end, and a shoulder at the end which goes through the arbor. l

The screw-stud rextcnds to the rear of the arbor I, and may be'plaeed in either of the hoes before menl tioned. Y

' On the screw-stud 1 is placed a gear wheel, J, in

the same vertical plane with the gear-wheel H, on the sere-w, and gears with it.

The gear-wheel il is'extended atits hub to the rear,

forming a sleeve, on which is keyed another gearwheel, K.

The nut and washer on the rear cud of the screwstud r are for the purpose of keeping the gear-wheels on the stud, at the same time allowing them' to re volve freely around the stud'. f

The gear-wheel K, on the sleeve, is a changeable Wheel; that is, it. may be substituted by a larger or smaller gear wheel, and gears with another wheel, L, on the main shaft A.

This last-mentioned gear-wheel (D, on the main shatt,) extends, at its hab, forward to the rear mailishaft bearing Bi, forming a sleeve, with ange at the forward end, over which the cap of the bearing B2 extends, so as to form a recess for the flange of the gear-i wheel to revolve in, at the same time preventing any motion in the longitudinal direction with the main shaft. I

The gear-wheel L, situated on the rear end of the main shaft, is provided with 'a feather in its bore, which is inserted into a key-seatiu the` main shalt,as seen in iig. 2, and the wheel is revolved b v the main shaft, said key-seat extending far enough forward to allow the required longitudinal motion ofthe main shaft.

The arborI, before I uentioned, is provided with a J circular slot between the two holes, tor the screw-stud fr, through which a screw-bolt s is passed and screwed -into the end of the machine-frame.

On this screw-bolt. there is a washer, t, between the arbor and the traine ofthe machine, of such thickness vthat when the bolt is screwed up, the arbor is hehl in position between the head of the bolt s aml the washer t.

Secured to the tol-ward side.of the rear main-shaft bearing Bi, are two springs, u a, one on each side of the main shaft, against which the lugs of the bent levers L l, on the yoke, strike, asthe main shaft moves tothe rear. l

Around the main shnftA is wound a strong spring, M,- the rear end. of which bears ou the forward colla-r g on the shaft, and the iin-ward end ofthe sprng'bears against a loose washer placed on the shaft, and against the rear end of the main-shaft bearing B1.

Alongside of the main shalt A there is adriviugshaft, N, revolving in bearings parallel and in the same horizontal plane with the main shaft, and has a conepulley, O, aml a geared pinion, P, secured to it.

This pinion gears with the gea-red driving-wheel E on the main shaft A. i

The driving-shaft'N has two collars, c o, at its rear bearing, which prevent the shaft n'iovinglon gitudinall y.

Uu the frontof the frame of the forward main-shaft bearing B there is a stop, t, oscillating on a pin in two lugs secured to the frame. This stop is made triangular' inits vertical section, made parallel with the main shaft. Its upperface is horizontal, its rear face.

'is vertical, and its frontfaee is inclined downward toward the rear, as seen intig. i.

The tumbler stop R is placed at such a distance from the centre of the main shaft, that when the boss ofthe die-box D is against the forward mainshaft bearing B, the sliding carrier-bn* bis nearest the axis ofthe die-box, aml the ring c of the die-box is in that position at which the dies are-open, the sliding carrier-bar will strike on Athe upper face of the tumblerstop, when thedic-box is revolved in the proper direction, and remain in `contact until the cuttingalies are closed, when the sliding carrier-bar will have moved' outward Yfrom the die-box far enough to allow the elbow of the sliding carrierfbar to pass on the outside of the tumbler-stop.

In front of the stop It, just described,`there is auother adjustable stop, S, tormed of arectangular bar, bent np at right angles at the flu-ward end, resting on the bed-plate, near the front end, under the main shaft. This adjustable stop is placed parallel with the main shaft, and passes throughan opening at thebottom of the forward frame, and under a clamp placed at the front end of the bed-plate. This clamp is provided with aset-screw, holding the stop in position; i

That part of this adjustable stop S which is bent 11p-toward the main shaft, is of such height that when the dies in the die-box are closed, and the sliding carrier-bar b is out to its farthest position from the axis ofthe die-boi', as the die-box moves forward, the ear'- rier slidiug-bar will strike the adjustable stop, and' be retained against it until the dies are opened, and lthe sliding carrier-bar is in its position, nearest the axis of the die-box, when the bar will pass the adjustable stop on the'inside, between it and the die-box.

On the opposite side of the main shaft fromfthe driving-shaft N, extending along the edge ofthebedplate, and beyond the forward end 0f it, there isa shaft, T, parallel with the main shaft, revolving suitable bearings, secured to' the bed-plate.

On the forward end of this shaft there is a circularV y disk, V, forming a face-plate, movable along the shaft,

but having a feather in its bore,iit.ting in a key-seat .in the shaft, to prevent the face-plate from revolving around the shaft.

The face-plate V is provided with a hub and Setserew on the front side, as seen in tig. 1, for holding the face-plate in position on Athe shaft. This face-plate is for holding the bolts'while they are being cnt. It is of such outside diameter that its circumference extends beyond the centre' of the die-box, situated on the main shaft.

At equal distances apart, in a circle equalin radius to the distance between the centre of the n'iaiu shaft l antf the centre ofthe face-plate shaft, there are openings, 'w w, through the face-plate, for passing the bolts to be cut.

On the side facing the die-box, the face-plate V is dishedfout, leaving a hub at the shaft, and a rim,:v, at

the circumference, which rim extends equally on both sides of the circle, struck with a radius equal to the distance between the two shafts.

In the rim x, and through each opening w, there is a radial recess, y, cut to the full depth of the part dshed out, and not quite to the outer circumference ofthe plate.

The sides of these recesses are dovetailed, and two dovetailed holding-dies z s are titted in each recess, the two dies iu,each recess constituting a pair, and each pair of dies has two setfscrews,- for the purpose of forcing the .two parts of the pair toward each other. l

One` set-screw, a?, is in the outer rim of the face# plate., and the' other set-screw, la', in a'. circular plate, \V, which occupies the part of the face-plate which is dished out between its hub and the rim x, all of-said set-screws pointing ina radial direction in the faceplate.

.,The bolts to be cutare placed parallel with the main shaft, between the two parts of cach .paiizof hohll ing-dies z, a recess beiug' cut across the side of each part next the bolt, and parallel withthe lnain shaft.

The sides of these recesses are serrated, ami of such form, that when they are set against the bolt, by means ofthe set-screws a antLb', the bolt will be held firmly, and parallel with the 'main shaft.

, On the same sha-ft 'l as the face-plate V, in front of and against the rear bearing'of the shaft, there is a ratchet-wheel, A', with the same number of square teeth as there are holding-dies in the facepl.\te V.

There is a pallet, c', wliich oscillates ou the-piu of a bracket, secured to the bed-plate, situated between the ratchet-wheel A and one of theside-platcs before nientioned,which is so constructed and situated that there are two teeth, one placed above the-other, at a distance equal to several teeth, and a. part of a tooth of the ratchet-wheel A', as seen in iig. 12, andwhen the radial face of any one ofthe teeth of the ratehet-vheel rests againstthe upper tooth of the pallet c', the bolt, situated inA one pair ot' the holding-dies z z, in the face-plate V, will have its axis in the same straight line with the axis of the main shaft A, and the lower tooth ol the pallet will be withdrawn ii'om the ratchetwheel A', and when the upper tooth ot' the palletis withdrawn trom the ratehet-wl'ieel, its lowertooth enters between two teeth of the wheel.

There is au arm ofthe pallet, e', 'extending on thel opposite side ofthe pin of the bracket, from the side the teeth are on, which has a spring, d',under it, with a tendency to force the arm up.

To the front, and further along'the saule shaft, nearly opposite the second main-shaft bearing there is another ratchet-wheel, D', which has the same umnber of equal teeth as the tirst-nu-ntionedratchet-wheel A', and is keyed to the same shaft T. The teeth in this forward ratchet-wheel D'are reversed to the teeth iu the rear wheel A', with the radial faces of tho teeth.

even with the radial faces of the teeth of the rear wheel.

Between the thrward ratchet-wheel 1)'and the sideplate, on the sameside of theniain shaft,l there is an there is a strong spring, g', with its other end bearing.

in the stirrup-strap j", which spring has a tendency to force the upright bar e downward.

There is a pawl, h', swung on a pin in lugs secured to the side ot the upright bar e', with a spring, i', behind it, for forcing the pawl between the teeth of the ratchet-wheel 1).

On the opposite side ofthe ratchet-wheel D', there is another pawl, k', swung ou a pin, in lugs secured to the bed-plate, and provided with a spring, l', which forces the pawl between the teeth of the wheel. l Y On the ratchet-wheel shaft T, againstlthe rear side of the tin'ward bearing, there is a collar, m', which prevents the shaft from moving forward, and there lis a boss on the rear ratchet-wheel A', which prevents the shaft moving to the rear.

Secured to the yoke l", at the bottom, there is an armyn', which extends under the side-plate, to its outer side., toward the ratchetwheel shaft T.'

Ou this -arm there is a feeding-bar, o', resting on the bed-plate, and hearing against the outside of the side-plate, the rear end of which inclines upward and to the rear, and the front end passes under a shoulder `of 'the upright bar e', before mentioned, as seen in fig. o.

On` the upper side of this feeding-bar o', there is an adjustable har, p', with its forward end inclined downward and forward.

The leerling-baro' is so constructed and situated, that when the yoke F is pushed to the rear as far as it can go, the rear ,inclined end of the feeding-bar forces the arm of the pallet o downward, and withdraws the upper tooth of the pallet from the rear ratchet-wheel A', and causes the lower toot-h of the pallet to enter between two of the teeth of the same ratchet-wheel.

To prepare the machine for cutting bolts of a desired length, diameter, and desired number ot' threads to the inch, it is necessary to placein the die-box D cuttingdies, with suitable thread and diameter, place a. changeable-gear wheel on the sleeve ofthe gear-wheel J, ou

the screw-stud of the arbor I, in order that the cut-` ting-dies may be advanced the proper distance forward for each revolution of `,the dies around the bolt to be cut. l

The arbor I is then moved around its centre until the chaligealale-gear. wheel Keomes into gear with the gear-wheel L, near the rear end ofthe lnain shaft A; then the screw-bolt s, passing through the slot iu the arbor, is se't up, and holds the arbor in place.

There are two holes in .the i'ame of the machine for this screw-holt, so that the. arbor may be put in position for anyof the dilierent-sized changeable wheels.

'We will suppose the yoke Fis drawn back until the rear eollargon thc main shaftstrikes against. the rear bearing l", and the bossof the die-box l) against the forward main-shalt bearing B. a

The lorward pieces of the. guides k'k must be secured in position for throwing the halfnnt h out of gear with the screw G, when the cutting-dies have advanced as fiar as desired on the bolt to be, ont.

The adjustable stop S, lor the sliding carrier-bar b, must be set in position to open the cutting-dies, just before the hlf nnt It is thrown ont of gear with the screw. The bolts to be out must be clamped in the holding-dies z z, by means of the radial set-screws a' b', in tue tace-plate V, so that as the Kufe-plate revo.ves, the centres ot' the bolts willpass through the cent-re line of the die-box. v

A belt on the eone-pxdley O is to conmiunicate motion from the driving-niacinnery to the cone-pulley revolving the same under,toward the main shaft.l This -motion is imnnnlmicated, through the. driving-simil: N, to the gear-wheel P, secured on it, alnl this gear-wheel causes the geared driving-whecll, on the main shaft A, to revolve in the opposite direction, revolving with it the main shal't, the die-box D, and the gear-wheel L, near the rear eml ofthe main shaft.

'The wheel L gears with and revolves, iu the oppositedireetion, the changeable-gear wheel K. This wheel heilig secured to the sleeve of the gear-wheel J, situned on the screw-stud lr, in the arbor I, causes the wheel J to revolve with it in the same direction. The wheel J causes the gear-wheel H, on the rear end of the screw G, aud the screw itself, to revolve in the Sallie direi-tion as the. main shaft A.

The yoke F being in its rear position, the two springs a n, on the rear bearing B2, will bear against the lugs on the bent levers ll, and three the upper ends ofsaid levers forward, and the 'lower ends downward. f

The lower ends of the bent-levers ll carry down with them the hall' nut h, by its pins or "arlus o o, causing it; to gear with the sore-w G.

'As the pins o o pass downward, th'ey bear on the inclined ends ofthe rear pieces of the guides k h', and push them lin-ward until the plus pass by the inclined ends ofthe guides.

The springs m, on the rear pieces of the guides,

then force the rear ends of the guides over the tops of the pins in the half'nut.

In* the drawing, only one of the rear pieces of the guides has a spring, and in this ease the other rear piece -is setI fast, s6 that the pin in the half nut will pass down b vits rear end without touching it.

In this position of the yoke E, theiuelined rear end of the feeding-har o will bear on the arm of the pallet c', so that the upper tooth is witlulrawn from the rear ratchet-wheel A', and the lower tooth will be between two teeth ofthe same. wheel.

We` will suppose that the upright bar e' has been raised until its pawl h' has gone between two teeth ofthe forward ratchet-wheel D', and the springy',

under the bed-plate, is bearing the upright haridownward, with a tendency to revolve the. ratchetwheel D"over toward the main shaft. This will have igiused the rear ratchet-wheel A' to revolve in the same direction, until the radial face ot' one. of its teeth bears against the lower tooth ofthe pallet c'. A

We will also suppose the cutting-dies a a to be opened.

As the die-box revolves, the sliding carrier-bar b strikes againstthe tumbler-stop It, and the bar band ring e are prevented from revolving, until the die-box has 'revolved far enough ,to bring the outer 'ends of the cutting-dies a a against the. circular part of the inside surface ot' the ring, the dies having been gradually closed by passing over the inclined sides'of the recesses in the ring a. f

At the same time, the cam-groove f, in the flange or collar d ot' the die-box, has passed' over the pin in the rear side ot' the sliding carrier-bar b, and moved said bar out in a radial direction, far enough for its elbow to pass over the outer side ot' the tumbler-stop R, when the sliding carrier-inurl) and ringe will revolve with the other parts of the die-box.1

As the screw G revolves, it advance? the halt'nut I' 7i, its pins or arms o o passing under the guides.

l`he halfnnt carries with it the yoke l", and the yoke carries with itthe main shaft A, die-box D, and feeding-bar o. v

There is always a little space left between the ends ofthe bolts to be eut aml the forward end of the diebox, so that when the feeding-'bar o isA advanced a short distance, and its inclined end left the arm .of the pallet c', said arm rises by means of its spring,ll, and the lower tooth o t' th'ewpallet reeedes from the rearratchet-wheel A. At the same time the upper tooth of the pallet enters between two teeth of the same ratchet-wheel.

The upright bar, with its pawl, descends, by means of the spring y', underneath the bed-plate, and causes the ratchet-wheels A D', and face-plate V, to revolve in the direi-tion before mentioned, until the radial face of one ot' the teeth ofthe rear ratchet-wheel A hasI come against the upper tooth oi' the pallet c', and a bolt to be cut in the face-plate is opposite the centre ot' the die-box; also, the pawl fla, on the opposite. side ofthe forward ratchet-wheel D, falls in behind the tooth whieh has just passed its ends.

The pawl h is to prevent the ratchet-wheels and face-plate from revolving in the contrary direction.v

As the parts betere mentioned advance,/the spring M, on the main shaft, is compressed between the forward collar g, on the main shaft-,aud the second mainshaft hearing B1.

At the same time, the feeding-bar o is passing under the upright bar e', and the adjustable bar 1l', on the upper side of the (eenling-bar, is raising .the up- -right bar until its pawl It takes in another tooth of theI forward ratchet-wheel D.

When the cutting-dies have cut a thread as far as desirable along the bolt, the sliding carrier-bar b being out to its greatest distance, strikes the adjustable stop S, and the bar b and ring e'are arrested from revolving, until the die-box and cutting-dies have revolved far enough .for the outer ends of the cutting-dies to enter the recesses in the ring.

The dies a a are opened gradually by their springs, and follow the inclined sides of the recesses in the ring.

When the dies have arrived opposite the middle. of the recesses in the ring, tlieeanegroove j', in the/collar d, of the diebox,. will have passed over the piu in the rear ot' the sliding carrier-bar b, and have drawn the said bar inward far enough for the outer end of the bar to pass inside ofthe adjustable stop S.

ly this time, the pins or arms o o, of the haltinut 71, inithe yoke l, will have borne on the inclined parts ofthe flanges ofthe forward pieces of the guides lc k, rising as they' advance, until they pass above the forward ends ofthe guides.

When the pinsin the halt` n'nt h have passed above the guides, the half-nutwill have been lifted out of shaft A, will force the yoke, main shaft, and dic-box and feeding-bar back .to-the rear; the rear collar g,

bearing B2.'

'lhe half-nut falls into gear, and the ratehet-wheels and face-plate make a revolution equal to only part of a tooth of the. ratchet-wheels. The machine is now in position for cutting another bolt.

The tmnbler-stop It is so'arranged, that if thefslidingcarricr-bar'b should strike it in going back, the inclined end ofthe elbow of the carrier-bar will strike the inclined end of the tumbler-stop, andthe stop will rise, when the carrier-bar revolves past, and the stop will fall into position by its own weight, andthe carrier-bar will strike on the upper side in the next revolution. n

A person stands in any convenient position, and takes out the bolts which are cut from the face-plate, by means ofslacking up the outer set-screws aa', and puts in new bolts.

The. screws-11' b', in the face-plate, are not altered unless bolts ot' tlii'erent diameters are tobe-eut.

Having thus fully described my invention',

lVhat I claim as new, and desire to secure by Letters Patent, is-

1. The combination of the die-box D, and its recessed ringr e, flange or collar (l, plate c, and sliding ea1rier-bar b, with the springs t' i, and cutting-dies a a, all constructed as described, and operating suhlstantially in the manner and for -the pui-poses herein set forth.

2. The combination of the main shaft A and collars q g, with the yoke F, screw G, halt nut h, and pins or arms o o, all constructed as described, aml op- -eraiing substantially in the manner and for the pur poses herein set forth. l

3. In combination with the yoke F and half nut h, the bent levers l Z, constructed as described, and operating substantially in the manner and for the purposes herein set forth.

4. In combination with the bent levers l1, the springs u u, secured to the rear main-shaft bearing B2, substantially as and for thc purposes herein set forth.

5. The guide it, constructed as described, of two alle] withthe mail'. shaft, substantially as and for the purposes herein set forth.

operating upon the rear bar ot' said guide, substautially in the manner and for the purposes herein sct forth.

7. In combination with the guideV 7.', the projecscribed, and operating substantially in theV manner and for the purposes herein set forth.

and L, arbor or oscillating plate I, screw-stud r, nut s, and washer t, all constructed as described, and operating substantially as and for the purposes herein set forth.

9.'In combination with the main shaft A and diebox D, the oscillating tun'ibler-stop 1-, and adjustable stop S, constructed as described, and operating substantially in the manner and for the purposes herein set t'orth.

10. The face-plate V, constructed as described, with the openings w Iw, ldovetailed recesses y y, rim -x, and circular plate W, all substantially as and for the purposes herein set fort-h. v

11.111 combination with the face-plate V, the dovetailed dies z z, and radial set-screws a' b', all

in the manner and for the purposes-herein set'fothi 12. The combination and arrangement ofl the facegear with the screw'G, and the spring,r M, on tlie mainot' the main shaft, striking against the rear main-shaft parallel bars, secured to aside-plate that runs par- 6. In combination with the guide if, the spring an,

tion or flange n, and spring 1), constructed as dev S. The arrangement of the gear-wheels HJ, KV

constructed as described, and operating substantially plate sha-ft T, ratchet-@heels A' D', pallets c'. h' L', In testimony that Iclnm tlie-wregoiug, I havnAV springs d y 'i' l', bnr e', and stirrup-strap f', all conhereunto set my hund, this 20th day of August, strnuteil as described, nml :mounting substantially in 1869.

the inannor :md for the purposes herein setforh; CHAS. E. DE VALIN. 125. 'lhe feeding-bau' o',. constructed :is described,

with its r'unr end hevellefl, and provided on its up- Witnesses:

per side. witlran :uljnsiazihlo han', p', nnd operated by G. J. BURN-AP,

menus of the nrxn n', on the yoke F, substantially Jxo. H. DE VALIN.

in the nimmer und for the purposes heleiu set forth. 

